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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd004ac7c821ed82b0e1c65b61f65902b9fa9425102335695a5372a2c7285498' 
  AND token = '2oHXvt3A3toFsKsADqGOWhSPFftueMEql1gTZa/B8/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}